JP2004348373A - Communication method, communication system and reader / writer using non-contact tag - Google Patents

Abstract

To provide a communication method, a communication system and a reader / writer for generating an error check code in a computer in order to improve the reliability of communication between the computer and a non-contact tag. The method is a communication method between an ID tag 3 that is a non-contact tag, a reader / writer 2 that performs wireless communication with the ID tag 3, and a computer 1 that is communicably connected to the reader / writer 2. The computer 1 includes a step of generating an error check code based on transmission data in the computer 1 and a step of transmitting the error check code and transmission data from the computer 1 to a reader / writer. Further, the method includes a step of receiving the error check code and the transmission data in the reader / writer 2 and transmitting the error check code and the transmission data to the ID tag 3, and a step of receiving the error check code and the transmission data in the ID tag 3 and performing an error check. Things.
[Selection diagram] Fig. 1

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a communication method using a non-contact tag, a communication system, and a reader / writer.
[0002]
[Prior art]
The non-contact tag is incorporated in various cards and the like, attracts attention as a new information recording medium, and is rapidly spreading to the market. It is expected to be used in various fields in the future.
[0003]
The non-contact tag does not have a power supply, but when approaching a reader / writer connected to a computer or the like, wireless communication is performed by electromagnetic induction coupling, and data is exchanged between the computer and the non-contact tag.
[0004]
In order to improve the reliability of communication between a computer and a non-contact tag, an error check is performed using an error check code. On the transmitting side, the result of the operation according to a certain generating polynomial is transmitted together with the data as an error check code, and on the receiving side, the same operation is performed and the error is detected by comparing with the error check code.
[0005]
In the conventional method, when data is transmitted from a computer to a contactless tag via a reader / writer, an error check code is generated in the reader / writer. Therefore, the computer cannot manage the error check code and can analyze the communication state between the reader / writer and the non-contact tag, but cannot analyze the communication state of the system including the computer.
[0006]
In addition, a technique for performing an error check using an error check code in a computer has been proposed (for example, see Patent Document 1). However, a configuration for generating an error check code in a computer is not disclosed.
[Patent Document 1]
Japanese Patent Application Laid-Open No. H11-149531
[Problems to be solved by the invention]
As described above, in the conventional communication method using the non-contact tag, when data is transmitted from the computer to the non-contact tag via the reader / writer, the error check code cannot be managed by the computer, and the data cannot be transmitted between the reader / writer and the non-contact tag. However, there is a problem that the communication state of the system including the computer cannot be analyzed.
[0009]
The present invention has been made to solve such a problem, and in order to improve the reliability of communication between a computer and a non-contact tag, a communication method, a communication system, and a communication system for generating an error check code in a computer. An object is to provide a reader / writer.
[0010]
[Means for Solving the Problems]
A communication method according to the present invention is a communication method between a non-contact tag, a reader / writer that performs wireless communication with the non-contact tag, and a computer communicably connected to the reader / writer, wherein the computer Generating an error check code based on the transmission data, transmitting the error check code and the transmission data from the computer to a reader / writer, receiving the error check code and the transmission data at the reader / writer, Transmitting the error check code and the transmission data to the non-contact tag, and executing an error check. Accordingly, the computer can manage the error check code, analyze the communication state between the computer and the non-contact tag, and improve the reliability of communication.
[0011]
The communication method described above, in the reader / writer, an open setting for transmitting an error check code transmitted from the computer to the non-contact tag, and an error check code is generated in the reader / writer and the non-contact tag is generated. And a storage unit for registering a close setting to be transmitted by transmitting the error check code transmitted from the computer to the contactless tag when the setting content registered in the storage unit is the open setting. It is characterized by the following. Thus, it is possible to select whether to generate the error check code by using the computer or the reader / writer in consideration of the communication state and the like. Further, when an error check code is generated in the reader / writer, it is possible to reduce addition of internal processing of the host computer.
[0012]
A communication system according to the present invention is a communication system including a contactless tag, a reader / writer that performs wireless communication with the contactless tag, and a computer communicably connected to the reader / writer, wherein the computer is An error check generation unit that generates an error check code based on transmission data, and a transmission unit that transmits the error check code and the transmission data to a reader / writer, wherein the reader / writer transmits the error check code and the transmission data from the computer. An error check code and the transmission data are received, and the non-contact tag receives the error check code and the transmission data, and performs an error check. Check means. Accordingly, the computer can manage the error check code, analyze the communication state between the computer and the non-contact tag, and improve the reliability of communication.
[0013]
The communication system described above, in the reader / writer, an open setting for transmitting an error check code transmitted from the computer to the non-contact tag, and an error check code generated in the reader / writer for the non-contact tag. A storage unit for registering a close setting to be transmitted by the transmission unit, wherein the transfer unit stores an error check code transmitted from the computer in the contactless tag when the setting content registered in the storage unit is the open setting. It is characterized in that it is transmitted to the user. Thus, it is possible to select whether to generate the error check code by using the computer or the reader / writer in consideration of the communication state and the like. Further, when an error check code is generated in the reader / writer, it is possible to reduce addition of internal processing of the host computer.
[0014]
The reader / writer according to the present invention is a reader / writer that performs wireless communication with a non-contact tag and is communicably connected to a computer, and receives the error check code and the transmission data transmitted from the computer. Means for transmitting the error check code and the transmission data received by the receiving means to the contactless tag. Accordingly, the computer can manage the error check code, analyze the communication state between the computer and the non-contact tag, and improve the reliability of communication.
[0015]
The above-described reader / writer has an open setting for transmitting an error check code transmitted from the computer to the non-contact tag, and a close setting for generating an error check code in the reader / writer and transmitting the error check code to the non-contact tag. The transmission means transmits an error check code transmitted from the computer to the non-contact tag when the setting content registered in the storage means is the open setting. It is characterized by the following. Thus, it is possible to select whether to generate the error check code by using the computer or the reader / writer in consideration of the communication state and the like. Further, when an error check code is generated in the reader / writer, it is possible to reduce addition of internal processing of the host computer.
[0016]
BEST MODE FOR CARRYING OUT THE INVENTION
First Embodiment of the Invention
First, the configuration of the communication system according to the first embodiment of the present invention will be described using FIG. As shown in FIG. 1, the communication system includes a host computer 1, a reader / writer 2 connected to the host computer 1, and an ID tag 3 for performing wireless communication with the reader / writer 2. I have.
[0017]
The host computer 1 includes a control unit (not shown), an operation unit, a display unit, and a connection unit of the reader / writer 2. The control unit includes means for generating an error check code based on the transmission data and transmitting the error check code together with the transmission data, and means for executing an error check based on the reception data and the error check code. Further, the control unit can transmit only the data without generating the error check code, and can not execute the error check of the received data.
[0018]
The reader / writer 2 includes a control circuit 21 which is an MPU (Micro Processing Unit) for controlling the entire reader / writer 2, an interface circuit 22 which is an ASIC (Application Specific Integrated Circuit) for a reader / writer as an interface, a transmission / reception circuit 23, and The transmission / reception antenna 24 is configured.
[0019]
The control circuit 21 is connected to the host computer 1 by, for example, a USB (Universal Serial Bus), and is also connected to an interface circuit 22 to exchange data. It receives data from the host computer 1, outputs the data to the interface circuit 22, inputs data from the interface circuit 22, and transmits the data to the host computer 1.
[0020]
Further, the control circuit 21 registers the open setting and the close setting in the interface circuit 22 according to a command from the host computer 1, for example. The open setting is a setting in which the reader / writer 2 transmits the error check code received from the host computer 1 to the ID tag 3 and transmits the error check code received from the ID tag 3 to the host computer 1 (hereinafter, referred to as “open setting”). the same). The close setting means that the reader / writer 2 generates an error check code based on the data received from the host computer 1 and transmits it to the ID tag 3, and performs an error check based on the error check code received from the ID tag 3. Setting (the same applies hereinafter).
[0021]
The interface circuit 22 includes a register 221 for storing registration of the open setting and the close setting.
[0022]
The interface circuit 22 is connected to the control circuit 21 and the transmission / reception circuit 23, and exchanges data. When data is input from the control circuit 21, the interface circuit 22 refers to the register 221 and outputs the input data and the error check code to the transmission / reception circuit 23 if the setting is open, and if the setting is closed, the received data is An error check code is generated based on the error check code and output to the transmission / reception circuit 23 together with the data. When data is input from the transmission / reception circuit 23, the interface circuit 22 refers to the register 221 and outputs the input data and the error check code to the control circuit 21 if the setting is open, and inputs the data if the setting is closed. An error check is performed based on the data and the error check code, and a check result is output to the control circuit 21 together with the data.
The transmission / reception circuit 23 is connected to the interface circuit 22 and the transmission / reception antenna 24, and exchanges data. The transmitting / receiving circuit 23 generates modulated data based on the data output from the interface circuit 22 and outputs the modulated data to the transmitting / receiving antenna 24. Further, the transmission / reception circuit 23 generates demodulated data based on the data output from the transmission / reception antenna 24 and outputs the demodulated data to the interface circuit 22.
[0024]
The ID tag 3 includes a transmission / reception antenna 31, a power generation unit 32, a control circuit 33, and a memory 34. The power generation unit 32 generates power based on the electromagnetic waves received by the transmission / reception antenna 31, and supplies the power to other components such as the control circuit 33. The control circuit 33 generates an error check code based on the transmission data, transmits the error check code together with the transmission data, and performs an error check based on the reception data and the error check code. The memory 34 stores data transmitted to and received from the host computer 1 via the reader / writer 2.
[0025]
Subsequently, a frame configuration in the communication system according to the first embodiment of the present invention will be described with reference to FIGS.
[0026]
With reference to FIG. 2, a description will be given of a frame configuration at the time of closing setting when data is transmitted from the host computer 1 to the ID tag 3. FIG. When the close setting is made, the error check code is generated by the reader / writer 2, so that the frame transmitted from the host computer 1 to the reader / writer 2 is expected to receive the response from the ID tag 3 as shown in FIG. It is composed of RXEB which is the number of bytes, command, and data. Further, as shown in FIG. 2B, the frame transmitted from the reader / writer 2 to the ID tag 3 includes an SOF (Start of Frame) indicating the start of the frame, a command, data, and a CRC (Error Check Code). It is composed of a Cyclic Redundancy Check) and an EOF (End of Frame) indicating the end of the frame.
[0027]
With reference to FIG. 3, a frame configuration at the time of open setting when transmitting data from the host computer 1 to the ID tag 3 will be described. At the time of the open setting, an error check code is generated by the host computer 1, and therefore, as shown in FIG. 3A, a frame transmitted from the host computer 1 to the reader / writer 2 is composed of RXEB, command, data, and CRC. It is configured. As shown in FIG. 3B, the frame transmitted from the reader / writer 2 to the ID tag 3 is composed of SOF, command, data, CRC, and EOF.
[0028]
Due to the difference between the frames shown in FIGS. 2 and 3, when the reader / writer 2 receives a frame from the host computer 1, the reader / writer 2 determines that the frame is open if there is a CRC and closes the frame if there is no CRC, and operates in the same manner as described above. You can also.
[0029]
With reference to FIG. 4, a description will be given of a frame configuration at the time of close setting when data is transmitted from the ID tag 3 to the host computer 1. FIG. Since the error check is performed by the reader / writer 2 at the time of the close setting, as shown in FIG. 4A, the frame transmitted from the reader / writer 2 to the host computer 1 includes a response, data, and ST1R which is communication error information. It consists of. Further, as shown in FIG. 4B, the frame transmitted from the ID tag 3 to the reader / writer 2 is composed of SOF, response, data, CRC, and EOF.
[0030]
With reference to FIG. 5, a description will be given of a frame configuration at the time of open setting when data is transmitted from the ID tag 3 to the host computer 1. FIG. At the time of the open setting, the error check is performed by the host computer 1. Therefore, as shown in FIG. 5A, the frame transmitted from the reader / writer 2 to the host computer 1 includes a response, data, CRC, and communication error information. It is composed of a certain ST1R. As shown in FIG. 5B, the frame transmitted from the ID tag 3 to the reader / writer 2 is composed of SOF, response, data, CRC, and EOF.
[0031]
Due to the difference between the frames in FIG. 4 and FIG. 5, when the host computer 1 receives a frame from the reader / writer 2, it determines that the CRC is open if it has a CRC and closes it if it does not, and operates in the same manner as described above. You can also.
[0032]
Other embodiments of the invention.
In the above example, the host computer connected to the reader / writer has been illustrated and described. However, the present invention is not limited to this, and may be a printer, a facsimile, a copying machine, a measuring machine, a game machine, or the like.
[0033]
Further, in the above-described example, the CRC has been described as an example of the error check code. However, the present invention is not limited to this, and an error correction code such as a Hamming code or a parity code may be used.
[0034]
【The invention's effect】
According to the present invention, it is possible to provide a communication method, a communication system, and a reader / writer for generating an error check code in a computer in order to improve the reliability of communication between the computer and the non-contact tag.
[Brief description of the drawings]
FIG. 1 is a configuration diagram of a communication system using a contactless tag according to the present invention.
FIG. 2 is a configuration diagram of a frame transmitted and received in a communication system using a contactless tag according to the present invention.
FIG. 3 is a configuration diagram of a frame transmitted and received in a communication system using a contactless tag according to the present invention.
FIG. 4 is a configuration diagram of a frame transmitted and received in a communication system using a contactless tag according to the present invention.
FIG. 5 is a configuration diagram of a frame transmitted and received in a communication system using a contactless tag according to the present invention.
[Explanation of symbols]
REFERENCE SIGNS LIST 1 host computer 2 reader / writer 3 ID tag 21 control circuit 22 interface circuit 23 transmission / reception circuit 24 transmission / reception antenna 31 transmission / reception antenna 32 power generation unit 33 control circuit 34 memory

Claims (6)

A non-contact tag, a reader / writer that performs wireless communication with the non-contact tag, and a communication method between a computer communicably connected to the reader / writer, wherein the computer checks an error check code based on transmission data. Generating,
Transmitting the error check code and the transmission data from the computer to a reader / writer,
Receiving the error check code and the transmission data in the reader / writer, and transmitting to the non-contact tag,
Receiving the error check code and the transmission data at the non-contact tag and performing an error check. The reader / writer has an open setting for transmitting an error check code transmitted from the computer to the non-contact tag, and a close setting for generating an error check code in the reader / writer and transmitting the error check code to the non-contact tag. A storage unit for registering, wherein when the setting content registered in the storage unit is the open setting, an error check code transmitted from the computer is transmitted to the non-contact tag. 1. The communication method according to 1. A communication system comprising: a contactless tag, a reader / writer that performs wireless communication with the contactless tag, and a computer communicably connected to the reader / writer, wherein the computer has an error check code based on transmission data. Error check generating means for generating, and transmission means for transmitting the error check code and the transmission data to a reader / writer,
The reader / writer has a transfer unit that receives the error check code and the transmission data transmitted from the computer and transfers the data to the non-contact tag,
A communication system, wherein the non-contact tag includes an error check unit that receives the error check code and the transmission data and performs an error check. The reader / writer has an open setting for transmitting an error check code transmitted from the computer to the non-contact tag, and a close setting for generating an error check code in the reader / writer and transmitting the error check code to the non-contact tag. When the setting registered in the storage is the open setting, the transfer unit transmits an error check code transmitted from the computer to the contactless tag. The communication system according to claim 3, wherein: While performing wireless communication with the non-contact tag, a reader / writer communicably connected to the computer,
Receiving means for receiving the error check code and the transmission data transmitted from the computer,
A reader / writer comprising: a transmission unit that transmits the error check code and the transmission data received by the reception unit to the contactless tag. The reader / writer has an open setting for transmitting an error check code transmitted from the computer to the non-contact tag, and a close setting for generating an error check code in the reader / writer and transmitting the error check code to the non-contact tag. A storage unit for registering, wherein the transmission unit transmits an error check code transmitted from the computer to the non-contact tag when the setting content registered in the storage unit is the open setting. The reader / writer according to claim 5, characterized in that:

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